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Epidote Group

Epidote group minerals are important rock-forming minerals because they are stable under a wide range of conditions. Many workers regard them as the low temperature, high-pressure equivalents of Ca-rich plagioclase minerals because of their petrologic usefulness. Epidotes are also among the most important silicates for understanding oxygen fugacity (the partial pressure of oxygen under which rocks crystallized) because they can contain significant amounts of Fe3+. They are found in many rock types, ranging from mid-ocean ridge basalts to amphibolites to granites to Ca-rich pelitic rocks.

The photo to the left is representative of this mineral group; however, it is not the same sample on which spectra listed below were measured.

Epidote, N6120C

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